git.openwrt.org Git - openwrt/staging/ldir.git/blob

   1 From 16188a175bccc8fc6809b2751ba853defdff9197 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Thu, 15 Dec 2022 15:57:18 +0000
   4 Subject: [PATCH] dtoverlays: Add overlay cm-swap-i2c0 to swap buses on
   5  i2c0mux
   6
   7 The legacy camera stack wiring instructions connect the cameras
   8 to the opposite sets of GPIOs compared to the arrangement
   9 more normally used with libcamera on all other platforms.
  10
  11 Add an overlay to allow easy swapping of the assignments so
  12 that the legacy wiring can be used with libcamera.
  13
  14 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  15 ---
  16  arch/arm/boot/dts/overlays/Makefile           |  1 +
  17  arch/arm/boot/dts/overlays/README             | 16 +++++++++++
  18  .../dts/overlays/cm-swap-i2c0-overlay.dts     | 27 +++++++++++++++++++
  19  3 files changed, 44 insertions(+)
  20  create mode 100644 arch/arm/boot/dts/overlays/cm-swap-i2c0-overlay.dts
  21
  22 --- a/arch/arm/boot/dts/overlays/Makefile
  23 +++ b/arch/arm/boot/dts/overlays/Makefile
  24 @@ -39,6 +39,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
  25         cap1106.dtbo \
  26         chipdip-dac.dtbo \
  27         cirrus-wm5102.dtbo \
  28 +       cm-swap-i2c0.dtbo \
  29         cma.dtbo \
  30         crystalfontz-cfa050_pi_m.dtbo \
  31         cutiepi-panel.dtbo \
  32 --- a/arch/arm/boot/dts/overlays/README
  33 +++ b/arch/arm/boot/dts/overlays/README
  34 @@ -787,6 +787,22 @@ Load:   dtoverlay=cirrus-wm5102
  35  Params: <None>
  36
  37
  38 +Name:   cm-swap-i2c0
  39 +Info:   Largely for Compute Modules 1&3 where the original instructions for
  40 +        adding a camera used GPIOs 0&1 for CAM1 and 28&29 for CAM0, whilst all
  41 +        other platforms use 28&29 (or 44&45) for CAM1.
  42 +        The default assignment through using this overlay is for
  43 +        i2c0 to use 28&29, and i2c10 (aka i2c_csi_dsi) to use 28&29, but the
  44 +        overrides allow this to be changed.
  45 +Load:   dtoverlay=cm-swap-i2c0,<param>=<val>
  46 +Params: i2c0-gpio0              Use GPIOs 0&1 for i2c0
  47 +        i2c0-gpio28             Use GPIOs 28&29 for i2c0 (default)
  48 +        i2c0-gpio44             Use GPIOs 44&45 for i2c0
  49 +        i2c10-gpio0             Use GPIOs 0&1 for i2c0 (default)
  50 +        i2c10-gpio28            Use GPIOs 28&29 for i2c0
  51 +        i2c10-gpio44            Use GPIOs 44&45 for i2c0
  52 +
  53 +
  54  Name:   cma
  55  Info:   Set custom CMA sizes, only use if you know what you are doing, might
  56          clash with other overlays like vc4-fkms-v3d and vc4-kms-v3d.
  57 --- /dev/null
  58 +++ b/arch/arm/boot/dts/overlays/cm-swap-i2c0-overlay.dts
  59 @@ -0,0 +1,27 @@
  60 +// SPDX-License-Identifier: GPL-2.0-only
  61 +// Definitions for IMX708 camera module on VC I2C bus
  62 +/dts-v1/;
  63 +/plugin/;
  64 +
  65 +#include <dt-bindings/gpio/gpio.h>
  66 +
  67 +/{
  68 +       compatible = "brcm,bcm2835";
  69 +
  70 +       fragment@0 {
  71 +               target = <&i2c0mux>;
  72 +               i2c0mux_frag: __overlay__ {
  73 +                       pinctrl-0 = <&i2c0_gpio28>;
  74 +                       pinctrl-1 = <&i2c0_gpio0>;
  75 +               };
  76 +       };
  77 +
  78 +       __overrides__ {
  79 +               i2c0-gpio0 = <&i2c0mux_frag>, "pinctrl-0:0=",<&i2c0_gpio0>;
  80 +               i2c0-gpio28 = <&i2c0mux_frag>, "pinctrl-0:0=",<&i2c0_gpio28>;
  81 +               i2c0-gpio44 = <&i2c0mux_frag>, "pinctrl-0:0=",<&i2c0_gpio44>;
  82 +               i2c10-gpio0 = <&i2c0mux_frag>, "pinctrl-1:0=",<&i2c0_gpio0>;
  83 +               i2c10-gpio28 = <&i2c0mux_frag>, "pinctrl-1:0=",<&i2c0_gpio28>;
  84 +               i2c10-gpio44 = <&i2c0mux_frag>, "pinctrl-1:0=",<&i2c0_gpio44>;
  85 +       };
  86 +};